Drive sub for a drilling tool



FIG. 1 is a front perspective view according to the present design;

FIG. 2 is a rear perspective view;

FIG. 3 is a top side view;

FIG. 4 is a front side view;

FIG. 5 is a bottom side view;

FIG. 6 is a back side view;

FIG. 7 is a left end view;

FIG. 8 is a right end view;

FIG. 9 is a sectional front side view in the direction indicated by Line9-9 in FIG. 7;

FIG. 10 is a sectional view in the direction indicated by Line 10-10 inFIG. 7; and,

FIG. 11 is a sectional view in the direction indicated by Line 11-11 inFIG. 7.

CLAIM The ornamental design for a drive sub for a drilling tool, asshown and described.